Choose text or a file
Text mode uses UTF-8. File mode encodes the original bytes without treating them as text. URL-safe replaces the plus and slash characters with a hyphen and underscore. Decoded files can be saved without opening them. For a byte-by-byte view of text, inspect its binary, decimal and hexadecimal values.
A worked example
Tool Octopus encodes to VG9vbCBPY3RvcHVz. Base64 is a representation, not encryption; anyone with the text can decode it.
Before you use the result
A decoded byte sequence may not be valid UTF-8. Use Download decoded file to retain those bytes. Keep the correct filename extension when saving a file.